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Timestamped electronic certification of documents

A signmii attests that a document, a photo, an archive or any digital file existed at a certified time.

A signmii is the ciphering with an RSA key of a SHA1 digest, a GMT timestamp and a serial number.

Certification
Verification

SHA1
ed0847ae3231350b0153cd8b9c8f56b87ab37801

Timestamp
2014-05-19T21:36:11Z

Number
0000000000000001

Signmii
uIWPRlfPaB8VgkTHIg8IoTe72WtTLgL_vGoWjY8PfM9fFjwXb8LmvMsMGKVUUTvJOy-z536BC-GMCOaDDdHhcWqGEYyUlXULwwGBXQL7drGnnbTa0H4bCD1YME6H9q7xIdMqlD9pIS-CIAsAo1SYguOhHP9bBlZ_7vk91gmKmxJQi6ril_UlvUmvmjJbUSnoyvDBLPcOWTa0hPDiPKnLifaimHHzkKfLtD9Ck2DAam9G3q3ME0zayVOTTlFdyPsOwvM6SvOMqAi-iBV40Bg5Ky4wKJztDMiCCBCdx3k-jvMfVtZM61MoIDNaICeI59UYE-HL8cPX3CcRphXYdFmRHg

The timestamp registered in a signmii is always the GMT time of its creation. The SHA1 associated to the timestamp proves that the corresponding file hasn't been modified since the signmii which contains its digital digest was created. The encoding with the private part of an RSA key ensures that only signmii.com can encrypt a signmii while allowing anyone to decrypt a signmii with the public part of the key. IMPORTANT: The certified file is never transmitted to signmii.com. The SHA1 is enough. The confidentiality of the data is guarantied.

QR

signmii.com can code a signmii in a QR.

Scanning the QR displays the content of the signmii.

▶ www.signmii.com

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