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THE ARCHIVE

Transmissions, hidden messages, decoded fragments and unfinished pages from the Cicada 3301 phenomenon. A record of what is known — and what remains unknown.

Blogs, research and in-depth write-ups explored by our team.

RECEIVE NEW TRANSMISSIONS

COMING SOON — Independent notes from the archive, research updates, and news from the $3301 community project.

THE FIRST TRANSMISSION

by 3301 ARCHIVE PROJECT

The image that began the internet’s most enduring cryptographic mystery.

Product
Models
Illustrative archive reconstruction

THE FIRST TRANSMISSION

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

A normal-looking file can contain an entirely different message.

Product
Data

THE FIRST TRANSMISSION

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

The hunt escaped the internet and entered the physical world.

News
Reflections
Agents

HIDDEN IN PLAIN SIGHT

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

For Cicada 3301, mathematics was another form of language.

THE ARCHIVE
Models
Data
Agents

HIDDEN IN PLAIN SIGHT

Illustrative archive reconstruction

A year after the first puzzle, the signal returned.

THE ARCHIVE

WHEN THE POSTERS APPEARED

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

Twenty-nine runes, letter values and prime-number associations.

Tutorials
Agents

WHEN THE POSTERS APPEARED

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

The third major puzzle left an unfinished book behind.

THE ARCHIVE
Models

FOLLOW THE PRIMES

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

The First Book remains the most haunting artifact of Cicada 3301.

Tutorials
Data

FOLLOW THE PRIMES

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

A glyph is not yet a word. A word is not yet a solution.

Product
Data

THE SECOND TRANSMISSION

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

The symbol can be copied. The cryptographic signature cannot be faked so easily.

Tutorials
Models

THE SECOND TRANSMISSION

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

The last widely authenticated public message appeared in April 2017.

THE ARCHIVE
Models

GEMATRIA PRIMUS

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

Every theory reveals a fascination. None has revealed the authors.

THE ARCHIVE
Agents

GEMATRIA PRIMUS

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

The mystery endured because people kept looking.

THE ARCHIVE
EVERY SIGNAL BEGINS SOMEWHERE.

THE THIRD ROUND

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

An independent on-chain tribute to an unfinished internet legend.

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Agents

THE THIRD ROUND

by 3301 ARCHIVE PROJECT

Illustrative archive reconstruction

The image that began the internet’s most enduring cryptographic mystery.

Product
Models