Enforcement Rules of the Classified National Security Information Protection Act Article 23
Classified information shall be sealed as follows:(1)Top Secret information and Secret information shall be handled and sealed by the processing official.(2)Classified information shall be contained in double-sealed envelops. The inner envelop shall be securely sealed and mark the classification designation on the upper left corner of the envelop. The outer envelop shall be thick enough to protect the classified information contained in the inner envelop. The address of the sending agency, the address of the receiving agency, the identity of the sender, the identity of the recipient, and the document number shall all be indicated on the outer envelop and inner envelop. However, the classification designation or any other marks which are sufficient to indicate the content of classified information shall not be shown on the outer envelop.(3)Giant volume of classified materials or mass quantity of classified information that cannot be contained and sealed according to the method prescribed in the preceding paragraph, shall be properly protected with necessary measures.
中文原文 國家機密保護法施行細則第23條
國家機密之封發方式如下：
一、「絕對機密」及「極機密」之封發，由承辦人員監督辦理。
二、國家機密應封裝於雙封套內，內封套左上角加蓋機密等級，並加密封，外封套應有適當厚度，內、外封套均註明收（發）文地址、收（發）文者及發文字號。
但外封套不得標示機密等級或其他足以顯示內容之註記。
三、體積及數量龐大之機密物品，不能以前款方式封裝者，應作適當之掩護措施。
一、「絕對機密」及「極機密」之封發，由承辦人員監督辦理。
二、國家機密應封裝於雙封套內，內封套左上角加蓋機密等級，並加密封，外封套應有適當厚度，內、外封套均註明收（發）文地址、收（發）文者及發文字號。
但外封套不得標示機密等級或其他足以顯示內容之註記。
三、體積及數量龐大之機密物品，不能以前款方式封裝者，應作適當之掩護措施。